1. Post in forums and include a link to your website or one of its pages.
2. Syndicate content
3. Let as many people as possible know about your articles
4. Hold an online competition offering a desirable prize.
5. Network and make friends
6. Online press releases
7. Craigslist
8. Social bookmarking websites
9. Rent / buy links
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Its all about inbound links from trusted sources .gov and .edu are highly regarded. To look for .gov link opportunities, try using Google's site search function - site:.gov or site:.edu so that your search results only return .gov.or .edu searches. Then follow this search with a keyword such as forums or blogs or directories. This will help you narrow down your search criteria to find those golden links easier.

Let me include some source of possible inbound links.

1. Forum because it always ask for signature
2. Blogging - well known blogging tools are blogspot and wordpress
3. Wiki - Wikipedia is a good source of links if the content is best for the resources link of wikipedia.

I know many SEO's who actively search for new ways to get inbound links, but they balance this with trying to get inbound links the old ways. I personally use a time clock to make sure that I spend at least 20 percent of my time in trying find new ways, and in researching progressions in the Google algorithm.

Many government departments are actively involved with many small companies and organisations. These companies co-exist with the government departments, and can actively promote the messages that the departments are dispersing in the community. For example, the Zero Waste SA department of the Government of South Australia links to this painters website, as it is promoting the same zero waste message. This is beneficial to both parties, as it improves the quality of the painters website, but it also promotes the interests of the government department.

What is craiglist? I'm new about this things

I got your point of forum, article and Social network but what was syndicate. Can you explain?

There are many ways through which we can build inbound backlinks for our websites. This includes the article submission, directory submission, press release, blog posting, business listings, social bookmarking, social media and social networking sites, forum participation.

But be clear that you should not make spam your site by doing some of the black hat seo techniques.